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Pacific Banana Slug
Ariolimax columbianus
18,751 observations
Horned Nudibranch
Hermissenda crassicornis
9,815 observations
Black Slug
Arion ater
5,134 observations
Frilled Dogwinkle
Nucella lamellosa
3,977 observations
Pacific Sideband
Monadenia fidelis
3,616 observations
Monterey Dorid
Doris montereyensis
3,421 observations
Lewis's Moon Snail
Neverita lewisii
3,259 observations
Leopard Slug
Limax maximus
3,235 observations
Brown-lipped Snail
Cepaea nemoralis
3,192 observations
White-lined Dirona
Dirona albolineata
2,869 observations
Garden Snail
Cornu aspersum
2,489 observations
Lined Chiton
Tonicella lineata
2,096 observations
Mossy Chiton
Mopalia muscosa
2,056 observations
Nuttall's Cockle
Clinocardium nuttallii
1,908 observations
Northern Leopard Dorid
Diaulula odonoghuei
1,692 observations
barnacle-eating dorid
Onchidoris bilamellata
1,619 observations
Giant Nudibranch
Dendronotus iris
1,491 observations
Branched Dendronotid
Dendronotus venustus
1,446 observations
White-and-orange-tipped Nudibranch
Antiopella fusca
1,399 observations
Oregon forestsnail
Allogona townsendiana
1,348 observations
Woody Chiton
Mopalia lignosa
1,268 observations
Gumboot Chiton
Cryptochiton stelleri
1,256 observations
Three-lined Aeolid
Orienthella trilineata
1,251 observations
Red Sponge Dorid
Rostanga pulchra
1,222 observations
Hooded Nudibranch
Melibe leonina
1,177 observations
Modest Clown Dorid
Triopha modesta
1,043 observations
Striped Dogwinkle
Nucella ostrina
1,023 observations
Nanaimo Dorid
Acanthodoris nanaimoensis
1,007 observations
Milky Slug
Deroceras reticulatum
1,003 observations
Purple Mahogany Clam
Nuttallia obscurata
989 observations
Black Leather Chiton
Katharina tunicata
935 observations
Noble Dorid
Peltodoris nobilis
894 observations
Robust Lancetooth Snail
Haplotrema vancouverense
894 observations
East Pacific Red Octopus
Octopus rubescens
823 observations
Rough Keyhole Limpet
Diodora aspera
783 observations
Yellow-bordered Taildropper
Prophysaon foliolatum
758 observations
Green Falsejingle
Pododesmus macrochisma
755 observations
Opalescent Inshore Squid
Doryteuthis opalescens
731 observations
Rocky Aeolid
Eubranchulus rupium
655 observations
Rough Piddock
Zirfaea pilsbryi
592 observations
Northwest Hesperian
Vespericola columbianus
581 observations
Heath's Dorid
Geitodoris heathi
567 observations
Striped Nudibranch
Armina californica
557 observations
Pacific Oyster
Magallana gigas
549 observations
Pacific Razor Clam
Siliqua patula
534 observations
Butter Clam
Saxidomus gigantea
516 observations
Festive Tritonid
Tritonia festiva
509 observations
Reticulate Taildropper
Prophysaon andersonii
501 observations
British Columbia Aeolid
Tenellia columbiana
487 observations
California Mussel
Mytilus californianus
477 observations
Frequently Asked Questions
- The 10 most common molluscs in Washington are:
- Pacific Banana Slug (Ariolimax columbianus)
- Horned Nudibranch (Hermissenda crassicornis)
- Black Slug (Arion ater)
- Frilled Dogwinkle (Nucella lamellosa)
- Pacific Sideband (Monadenia fidelis)
- Monterey Dorid (Doris montereyensis)
- Lewis's Moon Snail (Neverita lewisii)
- Leopard Slug (Limax maximus)
- Brown-lipped Snail (Cepaea nemoralis)
- White-lined Dirona (Dirona albolineata)
- The most observed mollusc in Washington is Pacific Banana Slug (Ariolimax columbianus), with 18,751 recorded observations.